
Thickening a sauce or soup without nuts in the mix sounds simple enough, but plenty of commercial thickeners and baking blends are processed alongside tree nuts, making even a basic slurry a potential concern. This two-ingredient fix sidesteps all of that by relying on pure arrowroot starch and cold water β nothing else, nothing hidden. The technique is straightforward: whisk the starch into cold water until completely smooth, then stir it into your simmering liquid and watch it transform into something glossy and beautifully coated in under a minute. Arrowroot gives sauces a lovely, almost silky sheen that cornstarch can't quite match, and it works across everything from gravies to fruit compotes to light broths. The one rule worth remembering is to pull the pan off the heat promptly β arrowroot is a little temperamental at a hard boil, so gentle heat and quick timing are your best friends here. Once you have this ratio memorized, you'll reach for it constantly as a clean, reliable finishing move for almost any dish.
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Combine the arrowroot starch and cold water in a small bowl and whisk or stir with a fork until completely smooth with no lumps remaining.
Bring the liquid you want to thicken (sauce, soup, or broth) to a gentle simmer in a saucepan over medium heat.
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